[photo-3d] projector bulbs

[John Toeppen <toeppen@xxxxxxxx>]

Bulb life becomes limited if a lamp is driven above the optimal color
temperature.  Bulbs will last ten times longer if driven only to an
amber glow.  Halogen bulbs are designed to run bluer and harder - they
will die sooner if not driven to the "halogen cycle" temperature. 
Variacs and a volt meter could be used.

Filament size is important.  Each part of the image has to have light
behind it.  The image of the filament should be projected into the pupil
of the projecting lens.  If the image of the filament is larger than the
aperture of the projecting lens that light does not reach the screen. 
The spherical reflector behind the lamp should be aligned so that the
returned image of the wires falls in the spaces between the wires - this
almost doubles the light ouput.  The light going sideways maybe absorbed
and reemitted, but is mostly lost.

Mark is correct in comments about the sizzel of overdrive.  It looks
better in bulbs.  In tube amps, it sounds better.  However Sovtec and
Tesla's have only keep their impressively liquid sound for a short while
when we do that.  That is what preamps are for.

John Toeppen
http://members.home.net/toeppen/

 

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